Allow cross build for windows using mingw32

- Build the compiler using CMake for:
  - Linux native gcc
  - Windows using mingw32
diff --git a/.travis.yml b/.travis.yml
index 2ae6fcb..d40e81c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -72,5 +72,7 @@
   - make -j$NUM_CPU && make dist
   - make cross -j$NUM_CPU
   - sh bootstrap.sh ; sh contrib/mingw-cross-compile.sh
+  - mkdir build_native && cd build_native && cmake ../compiler/cpp/ && make; cd ..
+  - mkdir build_mingw32 && cd build_mingw32 && cmake -DCMAKE_TOOLCHAIN_FILE=../contrib/mingw32-toolchain.cmake ../compiler/cpp/ && make; cd ..
 # TODO: add these steps
 #  - sh bootstrap.sh ; dpkg-buildpackage -tc
diff --git a/compiler/cpp/CMakeLists.txt b/compiler/cpp/CMakeLists.txt
index 5e07178..152e5db 100644
--- a/compiler/cpp/CMakeLists.txt
+++ b/compiler/cpp/CMakeLists.txt
@@ -37,7 +37,7 @@
 message(STATUS "Thrift version: ${thrift_VERSION} (${thrift_VERSION_MAJOR}.${thrift_VERSION_MINOR}.${thrift_VERSION_PATCH})")
 
 # Windows has a different header
-if(WIN32)
+if(MSVC)
     set(FLEX_FLAGS "--wincompat") # Don't use unistd.h on windows
     configure_file(${CMAKE_CURRENT_SOURCE_DIR}/src/windows/version.h.in ${CMAKE_CURRENT_BINARY_DIR}/version.h)
 else()
@@ -144,7 +144,6 @@
 include_directories(${CMAKE_CURRENT_BINARY_DIR} src)
 
 add_executable(thrift ${thrift_SOURCES})
-set_target_properties(thrift PROPERTIES VERSION ${thrift_VERSION})
 
 target_link_libraries(thrift libparse)
 
diff --git a/contrib/mingw32-toolchain.cmake b/contrib/mingw32-toolchain.cmake
new file mode 100644
index 0000000..3dfb1a5
--- /dev/null
+++ b/contrib/mingw32-toolchain.cmake
@@ -0,0 +1,19 @@
+# CMake mingw32 cross compile toolchain file

+

+# the name of the target operating system

+SET(CMAKE_SYSTEM_NAME Windows)

+

+# which compilers to use for C and C++

+SET(CMAKE_C_COMPILER i586-mingw32msvc-gcc)

+SET(CMAKE_CXX_COMPILER i586-mingw32msvc-g++)

+SET(CMAKE_RC_COMPILER i586-mingw32msvc-windres)

+

+# here is the target environment located

+SET(CMAKE_FIND_ROOT_PATH /usr/i586-mingw32msvc)

+

+# adjust the default behaviour of the FIND_XXX() commands:

+# search headers and libraries in the target environment, search 

+# programs in the host environment

+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)

+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)

+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)